(19)

(11)

EP 2 102 877 A1

(12)

(43) Date of publication: 23.09.2009 Bulletin 2009/39 (21) Application number: 07857615.4 (22) Date of filing: 14.12.2007

(51) International Patent Classification (IPC):  H01H 1/021(2006.01) (86) International application number: PCT/EP2007/063981 (87) International publication number: WO 2008/071793 (19.06.2008 Gazette 2008/25)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 15.12.2006 US 874960 P (71) Applicant: ABB Research LTD 8050 Zurich (CH)	(72) Inventors: ÖBERG, Åke 754 40 Uppsala (SE) ISBERG, Peter 725 92 Västerås (SE) (74) Representative: Kock, Ina  ABB AB Intellectual Property Ingenjör Bååths Gata 11 721 83 Västerås 721 83 Västerås (SE)